Plastic internally threaded container insert



FIG. 1 is a top plan view of a plastic internally threaded container insert showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a sectional view thereof, taken on line 4--4 of FIG. 1. 

The ornamental design for a plastic internally threaded container insert, as shown and described. 